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101 lines
2.8 KiB
C++
101 lines
2.8 KiB
C++
// Copyright (C) 2000 Stephen Cleary (shammah@voyager.net)
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//
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// This file can be redistributed and/or modified under the terms found
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// in "copyright.html"
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// This software and its documentation is provided "as is" without express or
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// implied warranty, and with no claim as to its suitability for any purpose.
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#ifndef BOOST_SYS_ALLOCATOR_H
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#define BOOST_SYS_ALLOCATOR_H
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// Symbols: malloc_allocator, new_delete_allocator
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#include <cstddef>
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#include <cstdlib>
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#include <boost/limits.hpp>
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#include <new>
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template <typename T>
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struct malloc_allocator
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{
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typedef T * pointer;
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typedef const T * const_pointer;
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typedef T & reference;
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typedef const T & const_reference;
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typedef T value_type;
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typedef std::size_t size_type;
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typedef std::ptrdiff_t difference_type;
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template <typename U>
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struct rebind
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{
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typedef malloc_allocator<U> other;
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};
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static pointer address(reference r) { return &r; }
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static const_pointer address(const_reference r) { return &r; }
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static pointer allocate(const size_type n, const pointer = 0)
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{
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const pointer ret = (pointer) std::malloc(n * sizeof(T));
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if (ret == 0)
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throw std::bad_alloc();
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return ret;
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}
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static void deallocate(const pointer p, const size_type)
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{ std::free(p); }
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static size_type max_size() { return std::numeric_limits<size_type>::max(); }
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bool operator==(const malloc_allocator &) const { return true; }
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bool operator!=(const malloc_allocator &) const { return false; }
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malloc_allocator() { }
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template <typename U>
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malloc_allocator(const malloc_allocator<U> &) { }
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static void construct(const pointer p, const_reference t)
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{ new ((void *) p) T(t); }
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static void destroy(const pointer p)
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{ p->~T(); }
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};
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template <typename T>
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struct new_delete_allocator
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{
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typedef T * pointer;
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typedef const T * const_pointer;
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typedef T & reference;
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typedef const T & const_reference;
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typedef T value_type;
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typedef std::size_t size_type;
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typedef std::ptrdiff_t difference_type;
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template <typename U>
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struct rebind
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{
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typedef new_delete_allocator<U> other;
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};
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static pointer address(reference r) { return &r; }
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static const_pointer address(const_reference r) { return &r; }
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static pointer allocate(const size_type n, const pointer = 0)
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{ return (pointer) new char[n * sizeof(T)]; }
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static void deallocate(const pointer p, const size_type)
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{ delete [] p; }
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static size_type max_size() { return std::numeric_limits<size_type>::max(); }
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bool operator==(const new_delete_allocator &) const { return true; }
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bool operator!=(const new_delete_allocator &) const { return false; }
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new_delete_allocator() { }
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template <typename U>
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new_delete_allocator(const new_delete_allocator<U> &) { }
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static void construct(const pointer p, const_reference t)
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{ new ((void *) p) T(t); }
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static void destroy(const pointer p)
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{ p->~T(); }
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};
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#endif |